I think, that it could be released in July, but from economical perspective, they have HS and Overwatch for Q2 2016, which will "save the day". And they have to release something in Q3 2016, so I think, that Legion will be out maybe in July, but if they will want to delay that expansion intentionaly because of Q3 results, it can be released at the end of the September. So what they will lose on WoW, they will gain throught Overwatch in Q2 and vice-versa in Q3